1 /*- 2 * Copyright (c) 2002 Tim J. Robbins 3 * All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD: head/lib/libc/locale/wcstod.c 227753 2011-11-20 14:45:42Z theraven $ 32 */ 33 34 35 #include <stdlib.h> 36 #include <wchar.h> 37 #include <wctype.h> 38 #include "xlocale_private.h" 39 40 /* 41 * Convert a string to a double-precision number. 42 * 43 * This is the wide-character counterpart of strtod(). So that we do not 44 * have to duplicate the code of strtod() here, we convert the supplied 45 * wide character string to multibyte and call strtod() on the result. 46 * This assumes that the multibyte encoding is compatible with ASCII 47 * for at least the digits, radix character and letters. 48 */ 49 double 50 wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, 51 locale_t locale) 52 { 53 static const mbstate_t initial; 54 mbstate_t mbs; 55 double val; 56 char *buf, *end; 57 const wchar_t *wcp = nptr; 58 size_t len; 59 size_t spaces = 0; 60 FIX_LOCALE(locale); 61 62 while (iswspace_l(*wcp, locale)) { 63 wcp++; 64 spaces++; 65 } 66 67 /* 68 * Convert the supplied numeric wide char. string to multibyte. 69 * 70 * We could attempt to find the end of the numeric portion of the 71 * wide char. string to avoid converting unneeded characters but 72 * choose not to bother; optimising the uncommon case where 73 * the input string contains a lot of text after the number 74 * duplicates a lot of strtod()'s functionality and slows down the 75 * most common cases. 76 */ 77 mbs = initial; 78 if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) { 79 if (endptr != NULL) 80 *endptr = (wchar_t *)nptr; 81 return (0.0); 82 } 83 if ((buf = malloc(len + 1)) == NULL) 84 return (0.0); 85 mbs = initial; 86 wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale); 87 88 /* Let strtod() do most of the work for us. */ 89 val = strtod_l(buf, &end, locale); 90 91 /* 92 * We only know where the number ended in the _multibyte_ 93 * representation of the string. If the caller wants to know 94 * where it ended, count multibyte characters to find the 95 * corresponding position in the wide char string. 96 */ 97 if (endptr != NULL) { 98 /* XXX Assume each wide char is one byte. */ 99 *endptr = (wchar_t *)nptr + (end - buf); 100 if (buf != end) 101 *endptr += spaces; 102 } 103 104 105 free(buf); 106 107 return (val); 108 } 109 double 110 wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr) 111 { 112 return wcstod_l(nptr, endptr, __get_locale()); 113 } 114